BBB Business Review

How do I troubleshoot a device fault on a DSC NEO?


After going through the trouble conditions to determine the zone/keypad/siren/repeater, you will need to determine how to fix the fault.

Hardwired Zones:

There only a couple of instances where you’ll see a zone fault on a hardwired zone. They can only occur on a fire zone or if you are using double end of line resistor zones. The most common one we encounter since people tend to not use any resistors, much less DEOL, is for fire zones. This will occur for fire zones when the system sees an open circuit. While smoke detectors are normally open zones they do require an end of line resistor in parallel so the system should see 5.6K ohm (2.2K for 2-wire) under normal conditions. The EOL resistor is required even if you are not using them on any other zone. This could mean that you either you forgot to put on the resistor, put it on incorrectly, or have a broken/cut/loose wire somewhere.

For a DEOL zone, it is much the same as the fire zones. If it sees an open circuit then it will give the fault condition. This could mean that the resistors are not connected properly or that the line is broken somewhere.

Wireless Devices:

For wireless zones, keypads, sirens, or repeaters a fault condition is caused by the system losing the supervisory connection. This is most often caused by the signal not reaching the transceiver module. The first thing to do is to do a placement test. Go into programming section 904 then scroll to or type in the number that corresponds to the wireless device that you need to test. If it results in bad or no signal then move the device closer and test again to confirm that the device is working properly. If it works from a closer range, the device may need to be moved or a wireless repeater added to boost the range to reach that location.